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<title>Problem 2428. -- [HAOI2006]均分数据 -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2428: [HAOI2006]均分数据</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>44&nbsp;&nbsp;<span class=green>Solved: </span>13<br>[<a href='submitpage.php?id=2428'>Submit</a>][<a href='problemstatus.php?id=2428'>Status</a>][<a href='bbs.php?id=2428'>Discuss</a>]</center><h2>Description</h2><div class=content><p>&nbsp;<a id="fck_paste_padding">
<p class="MsoNormal" style="text-indent: 21pt; display: inline !important; "><span style="font-family: 宋体; "><img alt="" src="http://61.187.179.132/JudgeOnline/upload/201108/1(1).jpg" /></span></p>
</a></p></div><h2>Input</h2><div class=content><p class="MsoNormal" style="text-indent:21.0pt"><span style="font-family:宋体;
mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;">第一行是两个整数，表示</span><span lang="EN-US">N,M</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;
mso-hansi-font-family:&quot;Times New Roman&quot;">的值（</span><span lang="EN-US">N</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">是整数个数，</span><span lang="EN-US">M</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">是要分成的组数）</span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span style="font-family:宋体;
mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;">第二行有</span><span lang="EN-US">N</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;
mso-hansi-font-family:&quot;Times New Roman&quot;">个整数，表示</span><span lang="EN-US">A1</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">、</span><span lang="EN-US">A2</span><span style="font-family:
宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;">、&hellip;&hellip;、</span><span lang="EN-US">An</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;
mso-hansi-font-family:&quot;Times New Roman&quot;">。整数的范围是</span><span lang="EN-US">1--50</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">。</span></p>
<p class="MsoNormal" style="text-indent:31.5pt;mso-char-indent-count:3.0"><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">（同一行的整数间用空格分开）</span></p>
<p></p></div><h2>Output</h2><div class=content><p><a id="fck_paste_padding">﻿</a></p>
<p><a id="fck_paste_padding">
<p class="MsoNormal" style="text-indent: 21pt; display: inline !important; "><span style="font-family:宋体;
mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;">这一行只包含一个数，表示最小均方差的值</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;
mso-hansi-font-family:&quot;Times New Roman&quot;">保留小数点后两位数字</span><span lang="EN-US">)</span><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:
&quot;Times New Roman&quot;">。</span></p>
</a></p>
<p></p>
<p></p></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata> 6  3<br />
1  2  3  4  5  6<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>0.00</span></div><h2>HINT</h2>
			<div class=content><p><p class="MsoNormal" style="margin-left:21.75pt"></p><br />
<p class="MsoNormal" style="margin-left:21.75pt"><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;<br />
mso-hansi-font-family:&quot;Times New Roman&quot;;color:black">对于</span><span lang="EN-US" style="color:black">40%</span><span style="font-family:宋体;mso-ascii-font-family:<br />
&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;color:black">的数据，保证有</span><span lang="EN-US" style="color:black">K&lt;=N &lt;= 10</span><span style="font-family:<br />
宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;<br />
color:black">，</span><span lang="EN-US" style="color:black">2&lt;=K&lt;=6</span></p><br />
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;<br />
mso-hansi-font-family:&quot;Times New Roman&quot;;color:black">对于全部的数据，保证有</span><span lang="EN-US" style="color:black">K&lt;=N &lt;= 20</span><span style="font-family:<br />
宋体;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;<br />
color:black">，</span><span lang="EN-US" style="color:black">2&lt;=K&lt;=6<o:p></o:p></span></p><br />
<p></p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Day2'>Day2</a></p></div><center>[<a href='submitpage.php?id=2428'>Submit</a>][<a href='problemstatus.php?id=2428'>Status</a>][<a href='bbs.php?id=2428'>Discuss</a>]</center>﻿<br>

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